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+The Coq documentation
+=====================
+
+The Coq documentation includes
+
+- A Reference Manual
+- A document presenting the Coq standard library
+
+The documentation of the latest released version is available on the Coq
+web site at [coq.inria.fr/documentation](http://coq.inria.fr/documentation).
+
+Additionnally, you can view the documentation for the current master version at
+<https://gitlab.com/coq/coq/-/jobs/artifacts/master/file/_install_ci/share/doc/coq/sphinx/html/index.html?job=documentation>.
+
+The reference manual is written is reStructuredText and compiled
+using Sphinx. See [`sphinx/README.rst`](sphinx/README.rst)
+to learn more about the format that is used.
+
+The documentation for the standard library is generated from
+the `.v` source files using coqdoc.
+
+Dependencies
+------------
+
+### HTML documentation
+
+To produce the complete documentation in HTML, you will need Coq dependencies
+listed in [`INSTALL`](../INSTALL). Additionally, the Sphinx-based
+reference manual requires Python 3, and the following Python packages:
+
+    sphinx sphinx_rtd_theme beautifulsoup4 antlr4-python3-runtime pexpect sphinxcontrib-bibtex
+
+You can install them using `pip3 install` or using your distribution's package
+manager. E.g. under recent Debian-based operating systems (Debian 10 "Buster",
+Ubuntu 18.04, ...) you can use:
+
+    apt install python3-sphinx python3-pexpect python3-sphinx-rtd-theme \
+                python3-bs4 python3-sphinxcontrib.bibtex python3-pip
+
+Then, install the missing Python3 Antlr4 package:
+
+    pip3 install antlr4-python3-runtime
+
+Nix users should get the correct development environment to build the
+HTML documentation from Coq's [`default.nix`](../default.nix) (note this
+doesn't include the LaTeX packages needed to build the full documentation).
+
+### Other formats
+
+To produce the documentation in PDF and PostScript formats, the following
+additional tools are required:
+
+  - latex (latex2e)
+  - pdflatex
+  - dvips
+  - makeindex
+
+Install them using your package manager. E.g. on Debian / Ubuntu:
+
+    apt install texlive-latex-extra texlive-fonts-recommended
+
+Compilation
+-----------
+
+To produce all documentation about Coq in all formats, just run:
+
+    ./configure           # (if you hadn't already)
+    make doc
+
+
+Alternatively, you can use some specific targets:
+
+- `make doc-ps`
+  to produce all PostScript documents
+
+- `make doc-pdf`
+  to produce all PDF documents
+
+- `make doc-html`
+  to produce all HTML documents
+
+- `make sphinx`
+   to produce the HTML version of the reference manual
+
+- `make stdlib`
+  to produce all formats of the Coq standard library
+
+
+Also note the `-with-doc yes` option of `./configure` to enable the
+build of the documentation as part of the default make target.
+
+
+Installation
+------------
+
+To install all produced documents, do:
+
+    make install-doc
+
+This will install the documentation in `/usr/share/doc/coq` unless you
+specify another value through the `-docdir` option of `./configure` or the
+`DOCDIR` environment variable.